Some of the most interesting UFO evidence comes in the form of old photographs taken before photo editing software existed. There is a small percentage of UFO cases that have no rational explanation. The UFOs in the old photos below could actually be of extraterrestrial origin.
8Farming UFO Photo, USA – 1920s
The only thing known about this picture is that it was taken somewhere in the United States in the early 1920s. The hilly terrain indicates that it could be on either the west or east coast, and is less likely in the central flat part of the country.